1. Associate Profssor, Swinburne Univ. of Technology, Faculty of Engineering and Industrial Sciences, P.O. Box 218, Hawthorn, Victoria 3122, Australia; and Senior Research Fellow, Melbourne Univ., Victoria 3010, Australia (corresponding author).
2. Associate Professor, Dept. of Civil and Environmental Engineering, Melbourne Univ., Victoria 3010, Australia.
3. Principal Engineer, Terrock Consulting Engineers, P.O. Box 829, Eltham, Victoria 3095, Australia.
4. Director, Terrock Consulting Engineers, Eltham, P.O. Box 829, Eltham, Victoria 3095, Australia.